Who can tell me something about the history of Ottoman Empire in Turkey?

At first, they were not Europeans, but Asian Turkic nomads from the Caspian Sea. However, from the14th century, Alhan led troops across the Turkish Strait to attack Europe, and then Sudan moved Turkmen businessmen, officials and nomads to the Balkans, and implemented the Thimar system, which created the Ottoman landlord class, making the Ottomans live in Greece, Macedonia, Bulgaria, Serbia and other places for hundreds of years, which can be said to be a European nation. They also reformed some people in Albania and Bosnia. However, the ethnic movements from the 0/9 th century to the early 20 th century led Serbia, Bulgaria, Greece and other countries to purge the local Turks, and the number of Turks in these countries was greatly reduced to the present European territory of Turkey.